6. 圖(一)之T形梁，\(f'_c = 210 \text{ kgf/cm}^2\)，\(f_y = 4200 \text{ kgf/cm}^2\)，梁之抗拉鋼筋面積\(A_s = 40.4 \text{ cm}^2\)，試求梁之彎矩計算強度\(M_n\):
(A) \(M_n = 62 \text{ tf-m}\)
(B) \(M_n = 66 \text{ tf-m}\)
(C) \(M_n = 70 \text{ tf-m}\)
(D) \(M_n = 74 \text{ tf-m}\)

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